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Q.1
The chemical (Ethyl Mercaptan) added to the otherwise odourless LPG cooking gas for imparting a detectable smell to the gas is a compound of:
Bromine
Fluorine
Chlorine
Sulphur
Q.2
The average salinity of seawater is
3%
3.5%
2.5%
2%
Q.3
When an iron nail gets rusted, iron oxide is formed
Without any change in the weight of the nail
With decrease in the weight of the nail
With increase in the weight of the nail
Without any change in colour or weight of the nail
Q.4
Which of the following is not an isotope of hydrogen?
Tritium
Deuterium
Protium
Yttrium
Q.5
The main constituents of pearls are
Calcium Oxide and Ammonium Chloride
Calcium Carbonate and Magnesium Carbonate
Aragonite and Conchiolin
Ammonium Sulphate and Sodium Carbonate
Q.6
Balloons are filled with
Nitrogen
Helium
Oxygen
Argon
Q.7
Which of the following does not contain a coinage metal?
Silver and Gold
Zinc and Gold
Copper and Silver
Copper and Gold
Q.8
Permanent hardness of water can be removed by adding:
Chlorine
Washing Soda
Potassium Permanganate
Bleaching Powder
Q.9
Marsh gas is
Nitrogen
Ethane
Methane
Hydrogen
Q.10
Tetraethyl lead is used as
Pain Killer
Fire Extinguisher
Mosquito Repellent
Petrol Additive
Q.11
Which of the following is used as a lubricant?
Graphite
Silica
Iron Oxide
Diamond
Q.12
From which mineral is radium obtained?
Rutile
Haematite
Limestone
Pitchblende
Q.13
What is laughing gas?
Nitrous Oxide
Carbon monoxide
Sulphur dioxide
Hydrogen peroxide
Q.14
Most soluble in water is:
Camphor
Sulphur
Common salt
Sugar
Q.15
Which of the following was to be discovered first in the chromospheres of the sun?
Krypton
Xenon
Neon
Helium
Q.16
Quartz crystals normally used in quartz clocks etc. is chemically
Silicon Dioxide
Germanium Oxide
A mixture of Germanium Oxide and Silicon dioxide
Sodium Silicate
Q.17
Which of the gas is not known as green house gas?
Methane
Nitrous oxide
Carbon dioxide
Hydrogen
Q.18
Which of the following is used in pencils?
Graphite
Silicon
Charcoal
Phosphorous
Q.19
Which of the following metals forms an amalgam with other metals?
Tin
Mercury
Lead
Zinc
Q.20
Soda water contains
Carbonic acid
Sulphuric acid
Carbon dioxide
Nitrous acid
Q.21
The element common to all acids is
Hydrogen
Carbon
Sulphur
Oxygen
Q.22
Non stick cooking utensils are coated with
Black paint
PVC
Teflon
polystyrene
Q.23
Galvanised iron sheets have a coating of
Lead
Chromium
Zinc
Tin
Q.24
The inert gas which is substituted for nitrogen in the air used by deep sea divers for breathing, is
Argon
Xenon
Helium
Krypton
Q.25
The gases used in different types of welding would include
Oxygen and Hydrogen
Oxygen, Hydrogen, Acetylene and Nitrogen
Oxygen, Acetylene and Argon
Oxygen and Acetylene
Q.26
Actinides are the elements with atomic numbers from
97 to 104
101 to 115
89 to 103
36 from 43
Q.27
Which of the following is in liquid form at room temperature?
Lithium
Sodium
Francium
Cerium
Q.28
Sodium metal is kept under:
Petrol
Alcohol
Water
Kerosene
Q.29
Bromine is a
Black Solid
Red Liquid
Colourless Gas
Highly Inflammable Gas
Q.30
The hardest substance available on earth is
Gold
Iron
Diamond
Platinum
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